LibreNMS up to 25.9.x Alert Rules Page cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in LibreNMS up to 25.9.x. Impacted is an unknown function of the component Alert Rules Page. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2025-62411. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in LibreNMS up to 25.9.x and classified as problematic. This issue affects some unknown functionality of the component Alert Rules Page. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

LibreNMS is a community-based GPL-licensed network monitoring system. LibreNMS <= 25.8.0 contains a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Transports management functionality. When an administrator creates a new Alert Transport, the value of the Transport name field is stored and later rendered in the Transports column of the Alert Rules page without proper input validation or output encoding. This leads to arbitrary JavaScript execution in the admin’s browser. This vulnerability is fixed in 25.10.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-62411 since 10/13/2025. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 25.10.0 eliminates this vulnerability. Applying the patch 706a77085f4d5964f7de9444208ef707e1f79450 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• LibreNMS

Version

• 25.0
• 25.1
• 25.2
• 25.3
• 25.4
• 25.5
• 25.6
• 25.7
• 25.8
• 25.9

License

• open-source

Website

• Product: https://github.com/librenms/librenms/

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